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Finding the Fourth Proportional to 85,407.60, 128,111.40 and 81,325.20

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Solution

The fourth proportional to 85,407.60, 128,111.40 and 81,325.20 is: 121,987.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,407.60 : 128,111.40 = 81,325.20 : x
  2. Step 2: Convert to fraction form
    85,407.60/128,111.40 = 81,325.20/x
  3. Step 3: Cross multiply
    85,407.60x = 128,111.40 × 81,325.20
  4. Step 4: Simplify right side
    85,407.60x = 10,418,685,227.28
  5. Step 5: Solve for x
    x = 10,418,685,227.28/85,407.60
  6. Step 6: Final answer
    x = 121,987.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.